condition mean min max ZT0-3 10.675136 10.675136 10.675136 ZT4-7 12.9223525 12.9223525 12.9223525 ZT8-11 34.637175 34.637175 34.637175 ZT12-15 22.459553 22.459553 22.459553 ZT16-19 19.628852000000002 19.628852000000002 19.628852000000002 ZT20-23 18.687646 18.687646 18.687646